#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <assert.h>
char* my_strcat(char* arr1, const char* arr2)
{
	assert(arr1 != NULL);
	assert(arr2 != NULL);
	char* tem = arr1;
	while (*arr1)
	{
		arr1++;
	}
	while (*arr1++ = *arr2++)
	{
		;
	}
	return tem;
}
int main(void)
{
	char arr1[10] = "qwer";
	char arr2[] = "asdf";
	printf("%s\n", my_strcat(arr1, arr2));
	return 0;
}